Football helmet shell



FIG. 1 is a right side view of a football helmet shell showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof; and,

FIG. 4 is a top plan view thereof.

The broken lines in the drawings depict portions of the football helmet shell that form no part of the claimed design. 

CLAIM The ornamental design for a football helmet shell, as shown and described. 